rtc: sh: add support for rza series

This same RTC is used in RZ/A series MPUs, therefore with some slight
changes, this driver can be reused. Additionally, since ARM architectures
require Device Tree configurations, device tree support has been added.

Signed-off-by: Chris Brandt <chris.brandt@renesas.com>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
diff --git a/drivers/rtc/Kconfig b/drivers/rtc/Kconfig
index 050bec7..8d3b957 100644
--- a/drivers/rtc/Kconfig
+++ b/drivers/rtc/Kconfig
@@ -1303,10 +1303,10 @@
 
 config RTC_DRV_SH
 	tristate "SuperH On-Chip RTC"
-	depends on SUPERH && HAVE_CLK
+	depends on SUPERH || ARCH_RENESAS
 	help
 	  Say Y here to enable support for the on-chip RTC found in
-	  most SuperH processors.
+	  most SuperH processors. This RTC is also found in RZ/A SoCs.
 
 	  To compile this driver as a module, choose M here: the
 	  module will be called rtc-sh.